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Status

Presumably Disbanded, crippled or destroyed

Illidan's forces[1][2][3] (also called Illidan's army[4][5][6]) consist of various factions that have banded together under the rule of Illidan Stormrage. They are one of the prime enemies of the Alliance and Horde in Outland, the other being the Burning Legion. The Betrayer commands vast armies throughout Outland, and even a few select groups on Azeroth; there are only a few places in the shattered world that are not inhabited by his legions.

With Illidan's death, it's presumed that this alliance of factions has fallen apart and now operate independently.

Fel Horde - When Illidan invaded Outland, Magtheridon's primary non-demonic forces were fel orcs, corrupted by his own blood. Led by Kargath Bladefist, the fel orcs are now in the Betrayer's service and primarily man the battlements of Hellfire Citadel. In addition, members of the Shadowmoon clan can be found on the Ata'mal Terrace of Illidan's Black Temple, and the survivors of the Dragonmaw clan - under their aged chieftain, Zuluhed the Whacked — capture and take control of nether drakes for service in Illidan's armies.

Blood elves - Illidan was briefly captured by his long-time jailor and nemesis, Maiev Shadowsong, shortly after arriving in Outland. It was primarily due to the intervention of Kael'thas Sunstrider and his blood elves that allowed the naga under Lady Vashj to free him. The blood elves under Kael's command, having been scorned by the Alliance, swore allegiance to Illidan and aided him in toppling Magtheridon. The Betrayer's most trusted legion of blood elf warriors is known as the Crimson Sigil; they are the highest commanders of Illidan's forces outside of the Black Temple itself. Though Kael betrayed Illidan and now serves Kil'jaeden, some blood elves are still loyal to the Betrayer, such as the demon hunter initiates under Varedis, and the Eclipsion - Blood elves under Grand Commander Ruusk.

Illidan's Naga - Calling in some old Highborne debts from ten millennia earlier, Illidan raised the naga from their undersea lairs in order to aid him in obtaining the Eye of Sargeras, as well as preventing Maiev from following him. Under the direction of Lady Vashj - The naga followed Illidan into Outland where they were instrumental in both obtaining the aid of the blood elves and laying siege to Magtheridon's fortress. They now control the watery areas of Outland, including much of Zangarmarsh.

Draenei -The Betrayer obtained the aid of Akama and his Broken draenei sometime before the siege of the Black Temple. The Broken proved to be proficient assassins and scouts, and were able to allow Illidan and his army to reach Magtheridon. Though only the Broken of Akama's tribe serve Illidan willingly (though the same cannot be said of Akama himself), Illidan's forces in Hellfire Peninsula and Zangarmarsh have enslaved Broken for menial labor. In addition to Broken, a few Lost One tribes have also entered in Illidan's service. Tribes working for Illidan:

Ashtongue tribe - A tribe of Broken in the service of Illidan Stormrage, they joined him to defeat Magtheridon and retained the alliance. They are the most evil Broken draenei tribe, and are used by Akama just to hide his true intentions

Murkblood - A group of this Broken tribe that resides in Nagrand serves the faction in Underbog[7], the faction in Underbog is allied or slaved by Lady Vashj, and the last faction is slaved by the Dragonmaw clan.

Dreghood - Almost this complete tribe of Broken is slaved by Illidan's forces.

Wrekt - A part of this Broken tribe was slaved by Illidan's Naga, the other part joined with the Lost Ones of Tuurem and have allied with Prince Kael'thas' blood elves.

Demons - Magtheridon, as a servitor of the Burning Legion, took control of Outland and brought legions of demonic forces with him. When Illidan toppled Magtheridon, many of these demons swore allegiance to the new lord of Outland. The types of demons that are seen in Illidan's armies are: